CN111022009B - Experimental device and experimental method for imbibition under pulse action - Google Patents
Experimental device and experimental method for imbibition under pulse action Download PDFInfo
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- CN111022009B CN111022009B CN201911375069.1A CN201911375069A CN111022009B CN 111022009 B CN111022009 B CN 111022009B CN 201911375069 A CN201911375069 A CN 201911375069A CN 111022009 B CN111022009 B CN 111022009B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention relates to a seepage and suction experimental device and a seepage and suction experimental method under the pulse action, and the specific scheme is as follows: preparing a core to be tested, loading the core into a seepage device, and adjusting the length of an inlet screw to control the core between an inlet core groove and an outlet core groove; connecting an experimental device, regulating the corresponding state by a three-way switch, filling water into a middle container, and adding a proper amount of water into a separating bottle through a drain pipe for oil-water separation; the pulse controller is controlled to set a pulse signal with a certain frequency, the advection pump is opened, pulse water injection is started, and a pulse pressure value is determined; and measuring the volume of oil driven by the imbibition effect, and calculating the imbibition displacement recovery ratio under the pulse effect. The invention adds the pulse device on the basis of the traditional imbibition experiment, not only considers the influence of pressure fluctuation and propagation on imbibition, but also can remove the large-amplitude intervention of displacement oil displacement on imbibition, can be used for researching imbibition oil displacement recovery ratio under the pulse action, and can realize natural imbibition and continuous water injection imbibition oil displacement effect evaluation.
Description
Technical Field
The invention relates to a seepage and suction experimental device and method under the pulse action, and belongs to the technical field of physical pulse seepage and suction oil displacement and recovery ratio improvement research.
Background
Imbibition is the process by which a porous medium spontaneously imbibes some wetting fluid due to capillary forces. For hydrophilic reservoirs, water is a wetting phase, oil is a non-wetting phase, and water phase can enter a rock matrix along a pore throat to displace crude oil in the rock matrix due to capillary force, so that the recovery ratio of the reservoir is increased. The main mechanism of the water injection development of the low-permeability fractured reservoir is to suck water in the fracture into the rock matrix through the imbibition effect to replace crude oil in the fracture, so that reasonable utilization of imbibition method oil extraction has important significance for improving the development effect for the low-permeability fractured reservoir.
Pulse water injection causes an unstable pressure state in the stratum by periodically changing the water injection quantity, the pressure in the stratum is periodically increased and decreased, the pressure field in the stratum is caused to be distributed unstably, and the flow of fluid in the stratum is opened by a keyhole channel and is driven out by capillary force and hydrodynamic force effects, so that residual oil is displaced. Due to the heterogeneity of the stratum, in one water injection period of pulse water injection, crude oil is driven out by removing displacement pressure difference, part of crude oil can be continuously replaced to a high-permeability channel from a low-permeability layer by periodic change of water injection pressure, and the recovery ratio of an oil reservoir is improved. Meanwhile, the pulse water injection mode is also regarded as a development means for effectively improving the seepage and oil displacement power. However, pulse water injection is a dynamic process, displacement and imbibition occur simultaneously, and how to better study the influence degree of pulse dynamic action on imbibition is a technical bottleneck of indoor study. At present, the imbibition effect is mainly developed through a natural static imbibition mode and a device, the influence of pressure wave fluctuation and propagation on the imbibition effect in the water injection process is not considered, and the influence measurement of different water injection development modes on the imbibition effect under an indoor experiment has larger errors. Therefore, the invention establishes a imbibition experimental device and a imbibition experimental method under the pulse action, which can be used for researching pulse water injection to improve imbibition action degree, so as to obtain optimal pulse water injection parameters, furthest improve imbibition oil extraction effect of low-permeability fractured reservoir, and provide a more accurate and practical method for researching imbibition effect under other indoor water injection modes.
At present, the indoor test imbibition oil extraction is mainly measured by a natural imbibition mode, and the influence of pressure wave fluctuation and propagation on imbibition effect in the water injection process is not considered, so that larger errors exist in measuring the influence of different water injection development modes on imbibition effect under an indoor experiment. The patent document 'method for improving the oil displacement efficiency of injected water imbibition by pressure pulse and determining the pulse times', application number: the core displacement method applied in the 201811320793. X' the core displacement must set confining pressure to form effective displacement at the injection and extraction ends, the displacement efficiency in the pulsating core displacement process comprises the oil displacement in the pulsating water injection process, the pressure fluctuation in the intermittent pulse process and the imbibition oil production generated by pressure change in the propagation process, and the file does not finely distinguish the displacement oil displacement and imbibition oil displacement, but mixes the displacement and imbibition oil displacement together, thus causing inaccuracy of calculation error and parameter optimization, in addition, the accurate nuclear magnetic resonance cost is high, the computer processing data is complex, time and labor are wasted, and the core test cannot be effectively realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a seepage and suction experimental device under the pulse action. The device can realize the evaluation of the imbibition displacement of reservoir oil effect under different pulse water injection frequencies and pulse water injection amplitudes, and calculate the imbibition displacement of reservoir oil recovery ratio under different pulse water injection conditions.
The invention also provides an experimental method of the device, a method for more accurately and effectively measuring the imbibition oil extraction without displacement pressure difference, and the method not only considers the influence of pressure fluctuation and propagation on imbibition on the basis of the traditional natural imbibition device, but also can remove the large-scale intervention of displacement oil extraction on imbibition, and has simple indoor operation and lower cost.
The technical scheme of the invention is as follows:
the experimental device for imbibition under the pulse action comprises a water supply part, a pulse part, an imbibition part and a separation part;
the water supply part comprises a horizontal pump and an intermediate container, and the intermediate container is filled with liquid;
The pulse part comprises a pulse controller and a pulse electromagnetic valve, the pulse electromagnetic valve is connected with the pulse controller, and the pulse controller is used for setting pulse signals; the pulse electromagnetic valve is used for executing a pulse switch signal set by the pulse controller and converting injected water into pulse water injection with a certain period; the middle container is connected with the pulse electromagnetic valve through a pipeline;
The seepage part comprises a seepage device, a core to be tested and a capillary measuring tube I, the seepage device comprises a cavity container with two open ends, one end of the cavity container is provided with an inlet screw, the other end of the cavity container is provided with an outlet screw, the inlet screw is in threaded connection with the cavity container, the end of the inlet screw is provided with an inlet core groove, the outlet screw is in threaded connection with the cavity container, the bottom of the outlet screw is provided with an outlet core groove, and the core to be tested is positioned between the inlet core groove and the outlet core groove; the inlet screw can adjust the inlet core groove to move in the imbibition device through threads, so that the core to be measured can be controlled between the inlet core groove and the outlet core groove; the inlet screw and the outlet screw are respectively provided with a through hole in a penetrating way, and the through holes are used for liquid circulation; the pulse electromagnetic valve is connected with the through hole of the inlet screw through a pipeline;
The separating part comprises a separating bottle and a drain pipe which are connected, the separating bottle is used for providing an oil-water separating space, the through hole of the outlet screw is connected with the separating bottle through a hose I, and the drain pipe is used for draining water and adding water into the separating bottle.
Preferably, the pulse portion further comprises a pressure sensor having one end connected to the pulse solenoid valve and a conduit having one end connected between the pulse solenoid valve and the inlet screw through hole. The pressure sensor can read the pulse water injection pressure value.
The pulse controller can control the opening and closing of the pulse electromagnetic valve, if the pulse electromagnetic valve is controlled to be opened for 2s or closed for 2s, the pulse water injection frequency with the frequency of 0.25HZ can be realized, the corresponding pulse water injection pressure is measured through the pressure sensor, the pulse water injection with different frequencies and different amplitudes can be set by adjusting the opening and closing time of the pulse electromagnetic valve and the injection speed of the water injection part, the imbibition displacement effect under different pulse frequencies is evaluated, and the corresponding recovery ratio is calculated.
Preferably, the cavity container is a transparent pressure-resistant glass container. The pressure-resistant purpose is to bear the pressure and pulse amplitude of the pulse injection water, and the transparent container wall can observe the imbibition reaction condition in the imbibition device at any time.
Preferably, the imbibition device further comprises a base, and the base is arranged at the bottom of the cavity container.
Preferably, the outlet core groove is of an iron wire net structure. Oil driven by imbibition is prevented from being blocked in the outlet core groove.
Preferably, the imbibition device further comprises a first capillary measuring tube, wherein the first capillary measuring tube is arranged at the upper part of the outlet of the through hole of the outlet screw, and is connected with the separating bottle through a pipeline. The scale is marked on the device, and the measurement can be performed.
Preferably, the separation part further comprises a second capillary measuring tube, and the second capillary measuring tube is arranged at the upper part of the separation bottle. The capillary measuring tube II measures the volume of oil displaced by imbibition.
Further preferably, the pulse water injection is a dynamic water continuous injection process, so that in order to ensure the influence of the dynamic fluctuation process on imbibition and ensure the accuracy of calculation of the amount of imbibition in the process, the height of the water discharge pipe is designed to be between the height of the separation bottle and the height of the capillary measuring pipe II, and the oil in the capillary measuring pipe is ensured not to be discharged while water is discharged, so that the volume of the oil driven by imbibition is measured.
Preferably, the middle part of the separating bottle is connected with the seepage part through a first hose, and the bottom of the separating bottle is connected with the drain pipe through a second hose.
Preferably, a tee joint I is arranged between the pulse electromagnetic valve and the intermediate container, a tee joint II is arranged between the pulse electromagnetic valve and the imbibition device, and the tee joint I is connected with the tee joint II through a pipeline.
The water supply part is connected with the pulse part and the pulse part is connected with the imbibition part through a tee joint I and a tee joint II, and each tee joint is provided with two switches which can be used for controlling different water injection routes to respectively perform natural imbibition experiments, continuous water injection imbibition experiments and pulse water injection imbibition experiments.
Preferably, the diameter width of the inlet core groove and the diameter width of the outlet core groove are both larger than the diameter width of the core to be measured.
Further preferably, the diameter of the core to be measured is 2.5cm, and the length of the core to be measured is 7.0cm; the diameters of the inlet core groove and the outlet core groove are 2.8cm, and the height is 1.0cm; the inner diameter of the cavity container is 5.0cm, and the length is 12.0cm. Because the diameter of the inlet core groove is slightly larger than that of the core, when the inlet screw is adjusted to control the core to be tested in the inlet core groove, a part of space remains between the core and the inlet core groove, so that the core can be used for imbibition reaction, a pulse water injection vibration space can be provided, and in addition, the surrounding pressure on the core cannot form effective displacement, so that the influence of pulse dynamic displacement on imbibition is avoided.
The experimental method for imbibition under the pulse action by utilizing the device specifically comprises the following steps:
(1) Cleaning and drying a rock core to be measured, firstly, saturating the rock core to be measured with experimental water, then, displacing the rock core to be measured with experimental oil, so that the rock core to be measured is saturated with the experimental oil, and measuring the volume of saturated oil of the rock core to be measured to be V 0;
(2) Loading a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) The water supply part, the pulse part, the seepage part and the separation part are connected, the switch II of the tee joint and the switch III of the tee joint are opened, the switch I of the tee joint and the switch IV of the tee joint are closed, a direct pipeline channel between the tee joint I and the tee joint II is blocked, water is filled in the intermediate container, and a proper amount of water is added into the separation bottle through the drain pipe for oil-water separation;
(4) The pulse controller is controlled to set a pulse signal with a certain frequency, the advection pump is opened, pulse water injection is started, and a pulse pressure value is determined through the pressure sensor;
(5) After a period of time, measuring the volume V t of oil driven by the imbibition through a capillary measuring tube II, and calculating the imbibition displacement recovery ratio eta t under the action of pulse;
(6) And (5) adjusting pulse water injection signals with different frequencies through a pulse controller, and repeating the steps (4) - (6).
The natural imbibition experimental method by using the device is different from the imbibition experimental method under the pulse action in that:
In the step (3), a separation part is removed when the device is connected, a hose I and a later device are removed, and a water supply part, a pulse part and a seepage part are connected; opening a first switch of the tee joint and a fourth switch of the tee joint, opening a direct pipeline channel between the first tee joint and the second tee joint, closing a second switch of the tee joint and a third switch of the tee joint, and enabling liquid to flow to the second tee joint directly from the tee joint without passing through a pulse electromagnetic valve;
In the step (4), a advection pump is opened, the pump is stopped after the imbibition device is filled with water, and a natural imbibition experiment is carried out;
In the step (5), the volume V t of oil driven by the imbibition is measured through a capillary measuring tube I, and the natural imbibition displacement recovery ratio eta t is calculated;
the experimental method for continuous water injection imbibition by using the device is different from the experimental method for imbibition under the pulse action in that:
In the step (3), a water supply part, a pulse part, a seepage part and a separation part are connected, a first switch of the tee joint and a fourth switch of the tee joint are opened in the experiment, a direct pipeline channel between the first tee joint and the second tee joint is opened, a second switch of the tee joint and a third switch of the tee joint are closed, and liquid directly flows from the tee joint to the second tee joint without passing through a pulse electromagnetic valve;
In the step (4), a advection pump is opened to inject water for continuous water injection imbibition experiments;
In the step (5), measuring the volume V t of oil driven by the imbibition action through a capillary measuring tube II, and calculating the continuous natural imbibition displacement recovery ratio eta t;
the invention has the beneficial effects that:
(1) The invention provides a seepage and suction experimental device under the pulse action, which can realize the evaluation of seepage and suction oil displacement effects under the pulse action and the evaluation of natural seepage and suction oil displacement effects by continuous water injection through changing the connection of the device and switching different control pipelines; the pulse device is added on the basis of the traditional imbibition experiment, so that the influence of pressure fluctuation and propagation on imbibition is considered, and the large-amplitude intervention of displacement oil displacement on imbibition can be removed.
(2) The invention considers the influence of pressure fluctuation and propagation on the imbibition effect in the development mode, solves the problem that a large error exists in the measurement imbibition effect of a pure natural static imbibition device, and provides a more accurate and practical development method for developing imbibition effect research under different water injection modes indoors.
(3) The cavity container of the seepage and suction device is transparent pressure-resistant glass, can bear the pressure and pulse amplitude effects of certain pulse injection water, and the transparent container wall can observe the seepage and suction reaction condition in the seepage and suction device at any time; the inlet screw can adjust the inlet core groove to move in the imbibition device through threads, so that the core to be measured can be controlled between the inlet core groove and the outlet core groove, and the outlet core groove is of an iron wire net structure, so that oil driven by imbibition is prevented from being blocked in the outlet core groove; the outlet part at the upper end of the seepage device is also provided with a capillary measuring tube I, and scales are marked on the capillary measuring tube I for measurement;
(4) The upper part of the separating bottle is provided with the capillary measuring tube II, the volume of oil driven by imbibition can be measured, the middle part of the separating bottle is connected with the imbibition part through the hose I, the tail part of the separating bottle is connected with the drain pipe through the hose II, water can be drained and added, the height of the drain pipe is between the height of the separating bottle and the height of the capillary measuring tube II, the oil in the capillary measuring tube can not be discharged while water is drained, and therefore the volume of the oil driven by imbibition can be measured;
(5) The method is simple and convenient to operate, has lower cost, can accurately measure the volume of the oil driven by the imbibition, calculates the imbibition displacement recovery ratio under various conditions more accurately, and provides a more accurate and practical method for researching imbibition effect under other water injection modes.
Drawings
FIG. 1 is a diagram of a structure of a imbibition experimental device under the pulse action of the invention;
FIG. 2 is a block diagram of a imbibition device according to the invention;
wherein: 1. a advection pump; 2. an intermediate container; 3-1, a tee joint I; 3-2, a tee joint II; 4-1, switching one; 4-2, a second switch; 4-3, a third switch; 4-4, a switch IV; 5. a pulse electromagnetic valve; 6. a pressure sensor; 7. a pulse controller; 8. a imbibition device; 8-1, a cavity container; 8-2, an inlet screw; 8-3, imported core grooves; 8-4, an outlet screw; 8-5 outlet core slots; 8-6 bases; 9. core to be measured; 10-1, capillary measuring tube I; 10-2, a capillary measuring tube II; 11-1, a first hose; 11-2, a second hose; 12. separating the bottle; 13. and (5) a water drain pipe.
Detailed Description
The invention will now be further illustrated by way of example, but not by way of limitation, with reference to the accompanying drawings.
Example 1:
the experimental device comprises a water supply part, a pulse part, a imbibition part and a separation part.
The water supply part comprises a horizontal pump and an intermediate container, and the intermediate container is filled with liquid.
The pulse part comprises a pulse controller and a pulse electromagnetic valve, the pulse electromagnetic valve is connected with the pulse controller, and the pulse controller is used for setting pulse signals; the pulse electromagnetic valve is used for executing a pulse switch signal set by the pulse controller and converting injected water into pulse water injection with a certain period; the intermediate container is connected with the pulse electromagnetic valve through a pipeline.
The imbibition part comprises an imbibition device, a core to be tested and a capillary measuring tube I, the imbibition device comprises a cavity container with two open ends, and the cavity container is a transparent pressure-resistant glass container. The pressure-resistant purpose is to bear the pressure and pulse amplitude of the pulse injection water, and the transparent container wall can observe the imbibition reaction condition in the imbibition device at any time.
One end of the cavity container is provided with an inlet screw, the other end of the cavity container is provided with an outlet screw, the inlet screw is in threaded connection with the cavity container, the end part of the inlet screw is provided with an inlet core groove, the outlet screw is in threaded connection with the cavity container, the bottom of the outlet screw is provided with an outlet core groove, and a core to be measured is positioned between the inlet core groove and the outlet core groove; the inlet screw can adjust the inlet core groove to move in the imbibition device through threads, so that the core to be measured can be controlled between the inlet core groove and the outlet core groove; the inlet screw and the outlet screw are respectively provided with a through hole in a penetrating way, and the through holes are used for liquid circulation; the pulse electromagnetic valve is connected with the through hole of the inlet screw through a pipeline.
The separating part comprises a separating bottle and a drain pipe which are connected, the separating bottle is used for providing an oil-water separating space, the through hole of the outlet screw is connected with the separating bottle through a hose I, and the drain pipe is used for draining water and adding water into the separating bottle.
Example 2:
The experimental device for imbibition under the action of pulse is as in example 1, except that the pulse part further comprises a pressure sensor, one end of the pressure sensor is connected to the pulse electromagnetic valve, and the other end of the pressure sensor is connected to a pipeline between the pulse electromagnetic valve and the through hole of the inlet screw. The pressure sensor can read the pulse water injection pressure value.
The pulse controller can control the opening and closing of the pulse electromagnetic valve, if the pulse electromagnetic valve is controlled to be opened for 2s or closed for 2s, the pulse water injection frequency with the frequency of 0.25HZ can be realized, the corresponding pulse water injection pressure is measured through the pressure sensor, the pulse water injection with different frequencies and different amplitudes can be set by adjusting the opening and closing time of the pulse electromagnetic valve and the injection speed of the water injection part, the imbibition displacement effect under different pulse frequencies is evaluated, and the corresponding recovery ratio is calculated.
Example 3:
the experimental device for imbibition under the action of pulse has the structure as in the embodiment 1, except that the imbibition device further comprises a base, and the bottom of the cavity container is provided with the base.
Example 4:
The experimental device for imbibition under the action of pulse has the structure as described in the embodiment 1, except that the outlet core groove has an iron wire net structure. Oil driven by imbibition is prevented from being blocked in the outlet core groove.
Example 5:
The experimental device for imbibition under the action of pulse has the structure as in the embodiment 2, except that the experimental device for imbibition also comprises a capillary measuring tube I, wherein the capillary measuring tube I is arranged at the upper part of a through hole outlet of an outlet screw, and scales are marked on the capillary measuring tube I for measurement; the capillary measuring tube I is connected with the separating bottle through a pipeline. The scale is marked on the device, and the measurement can be performed.
The separation part also comprises a second capillary measuring tube, and the second capillary measuring tube is arranged at the upper part of the separation bottle. The capillary measuring tube II measures the volume of oil displaced by imbibition.
The pulse water injection is a continuous injection process of dynamic water, so that the height of a water discharge pipe is designed to be between the height of a separating bottle and the height of a capillary measuring pipe II so as to ensure that the oil in the capillary measuring pipe is not discharged while water is discharged, and the volume of the oil driven by the imbibition is measured in order to ensure the influence of the dynamic fluctuation process on imbibition and the accuracy of calculation of the imbibition oil quantity in the process.
Example 6:
the experimental device for imbibition under the action of pulse has the structure as in the embodiment 5, except that the middle part of the separating bottle is connected with the imbibition part through a hose I, and the bottom of the separating bottle is connected with the drain pipe through a hose II.
Example 7:
the experimental device for imbibition under the pulse action has the structure as in the embodiment 5, except that a tee joint I is arranged between the pulse electromagnetic valve and the intermediate container, a tee joint II is arranged between the pulse electromagnetic valve and the imbibition device, and the tee joint I is connected with the tee joint II through a pipeline.
The water supply part is connected with the pulse part and the pulse part is connected with the imbibition part through a tee joint I and a tee joint II, and each tee joint is provided with two switches which can be used for controlling different water injection routes to respectively perform natural imbibition experiments, continuous water injection imbibition experiments and pulse water injection imbibition experiments.
Example 8:
The experimental device for imbibition under the action of pulse has the structure as in the embodiment 1, except that the diameter width of the inlet core groove and the diameter width of the outlet core groove are larger than the diameter width of the core to be tested.
The diameter of the core to be measured is 2.5cm, and the length of the core to be measured is 7.0cm; the diameters of the inlet core groove and the outlet core groove are 2.8cm, and the height is 1.0cm; the inner diameter of the cavity container is 5.0cm, and the length is 12.0cm. Because the diameter of the inlet core groove is slightly larger than that of the core, when the inlet screw is adjusted to control the core to be tested in the inlet core groove, a part of space remains between the core and the inlet core groove, so that the core can be used for a imbibition reaction, a pulse water injection vibration space can be provided, and in addition, the surrounding pressure on the core cannot form effective displacement, so that the influence of pulse displacement oil displacement on imbibition is avoided.
Example 9
A method for performing a imbibition experiment under the action of pulses by using the device of the embodiment 7 specifically comprises the following steps:
(1) Cleaning and drying a rock core to be measured, firstly, saturating the rock core to be measured with experimental water, then, displacing the rock core to be measured with experimental oil, so that the rock core to be measured is saturated with the experimental oil, and measuring the volume of saturated oil of the rock core to be measured to be V 0;
(2) Loading a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) The water supply part, the pulse part, the seepage part and the separation part are connected, as shown in figure 1, the switch II of the tee joint and the switch III of the tee joint are opened, the switch I of the tee joint and the switch IV of the tee joint are closed, a direct pipeline channel between the tee joint I and the tee joint II is blocked, water is filled in the intermediate container, and a proper amount of water is added in the separation bottle through a drain pipe for oil-water separation;
(4) The pulse controller is controlled to set a pulse signal with a certain frequency, the advection pump is opened, pulse water injection is started (only fluctuation and propagation of pressure waves are formed, displacement is not formed), and a pulse pressure value is determined through the pressure sensor;
(5) After a period of time, measuring the volume V t of oil driven by the imbibition through a capillary measuring tube II, and calculating the imbibition displacement recovery ratio eta t under the action of pulse; Wherein:
η t: recovery ratio at time t,%;
V t: the volume of the imbibition displacement at the moment t is cm 3;
V 0: saturated oil volume, cm 3.
(6) And (5) adjusting pulse water injection signals with different frequencies through a pulse controller, and repeating the steps (4) - (6).
Example 10
A natural imbibition test method by using the device of the embodiment 7, the steps of which are as described in the embodiment 9, and the difference between the natural imbibition test method and the imbibition test method under the pulse action is that:
In the step (3), a separation part is removed when the device is connected, a hose I and a later device are removed, and a water supply part, a pulse part and a seepage part are connected; opening a first switch of the tee joint and a fourth switch of the tee joint, opening a direct pipeline channel between the first tee joint and the second tee joint, closing a second switch of the tee joint and a third switch of the tee joint, and enabling liquid to flow to the second tee joint directly from the tee joint without passing through a pulse electromagnetic valve;
In the step (4), a advection pump is opened, the pump is stopped after the imbibition device is filled with water, and a natural imbibition experiment is carried out;
In the step (5), the volume V t of oil driven by the imbibition is measured through a capillary measuring tube I, and the natural imbibition displacement recovery ratio eta t is calculated;
Example 11
A continuous water injection imbibition experimental method by using the device of the embodiment 7, which is characterized by comprising the following steps as in the embodiment 9 and is different from the imbibition experimental method under the pulse effect:
In the step (3), a water supply part, a pulse part, a seepage part and a separation part are connected, a first switch of the tee joint and a fourth switch of the tee joint are opened in the experiment, a direct pipeline channel between the first tee joint and the second tee joint is opened, a second switch of the tee joint and a third switch of the tee joint are closed, and liquid directly flows from the tee joint to the second tee joint without passing through a pulse electromagnetic valve;
In the step (4), a advection pump is opened to inject water for continuous water injection imbibition experiments;
In the step (5), measuring the volume V t of oil driven by the imbibition action through a capillary measuring tube II, and calculating the recovery ratio eta t of continuous water injection imbibition displacement;
Claims (10)
1. The experimental device for imbibition under the pulse action is characterized by comprising a water supply part, a pulse part, an imbibition part and a separation part;
the water supply part comprises a horizontal pump and an intermediate container, and the intermediate container is filled with liquid;
The pulse part comprises a pulse controller and a pulse electromagnetic valve, the pulse electromagnetic valve is connected with the pulse controller, and the pulse controller is used for setting pulse signals; the pulse electromagnetic valve is used for executing a pulse switch signal set by the pulse controller and converting injected water into pulse water injection with a certain period; the middle container is connected with the pulse electromagnetic valve through a pipeline;
The seepage part comprises a seepage device, a core to be tested and a capillary measuring tube I, the seepage device comprises a cavity container with two open ends, one end of the cavity container is provided with an inlet screw, the other end of the cavity container is provided with an outlet screw, the inlet screw is in threaded connection with the cavity container, the end of the inlet screw is provided with an inlet core groove, the outlet screw is in threaded connection with the cavity container, the bottom of the outlet screw is provided with an outlet core groove, and the core to be tested is positioned between the inlet core groove and the outlet core groove; the inlet screw and the outlet screw are respectively provided with a through hole in a penetrating way, and the through holes are used for liquid circulation; the pulse electromagnetic valve is connected with the through hole of the inlet screw through a pipeline;
The separating part comprises a separating bottle and a drain pipe which are connected, the separating bottle is used for providing an oil-water separating space, the through hole of the outlet screw is connected with the separating bottle through a hose I, and the drain pipe is used for draining water and adding water into the separating bottle.
2. The apparatus of claim 1, wherein the pulse section further comprises a pressure sensor connected at one end to the pulse solenoid valve and at one end to a conduit between the pulse solenoid valve and the inlet screw through hole.
3. The experimental device for imbibition under the action of pulse according to claim 1, wherein the outlet core groove is of an iron wire net structure;
the cavity container is a transparent pressure-resistant glass container;
the imbibition device also comprises a base, and the bottom of the cavity container is provided with the base.
4. The experimental device for imbibition under the action of pulse according to claim 2, wherein the imbibition device further comprises a capillary measuring tube I, the capillary measuring tube I is arranged at the upper part of the outlet of the through hole of the outlet screw, and the capillary measuring tube I is connected with the separating bottle through a pipeline;
the separation part also comprises a second capillary measuring tube, and the second capillary measuring tube is arranged at the upper part of the separation bottle.
5. The apparatus according to claim 4, wherein the height of the drain pipe is between the height of the separating bottle and the capillary measuring tube II;
the middle part of the separating bottle is connected with the seepage part through a first hose, and the bottom of the separating bottle is connected with the drain pipe through a second hose.
6. The experimental device for imbibition under the action of pulse according to claim 4, wherein a tee joint I is arranged between the pulse electromagnetic valve and the intermediate container, a tee joint II is arranged between the pulse electromagnetic valve and the imbibition device, and the tee joint I and the tee joint II are connected through a pipeline.
7. The experimental device for imbibition under the action of pulse according to claim 1, wherein the diameter width of the inlet core groove and the diameter width of the outlet core groove are both larger than the diameter width of the core to be tested;
the diameter of the core to be measured is 2.5cm, and the length of the core to be measured is 7.0cm; the diameters of the inlet core groove and the outlet core groove are 2.8cm, and the height is 1.0cm; the inner diameter of the cavity container is 5.0cm, and the length is 12.0cm.
8. A method for performing a pulse-action imbibition experiment by using the pulse-action imbibition experimental device of claim 6, comprising the steps of:
(1) Cleaning and drying a rock core to be measured, firstly, saturating the rock core to be measured with experimental water, then, displacing the rock core to be measured with experimental oil, so that the rock core to be measured is saturated with the experimental oil, and measuring the volume of saturated oil of the rock core to be measured to be V 0;
(2) Loading a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) The water supply part, the pulse part, the seepage part and the separation part are connected, the switch II of the tee joint and the switch III of the tee joint are opened, the switch I of the tee joint and the switch IV of the tee joint are closed, a direct pipeline channel between the tee joint I and the tee joint II is blocked, water is filled in the intermediate container, and a proper amount of water is added into the separation bottle through the drain pipe for oil-water separation;
(4) The pulse controller is controlled to set a pulse signal with a certain frequency, the advection pump is opened, pulse water injection is started, and a pulse pressure value is determined through the pressure sensor;
(5) After a period of time, measuring the volume V t of oil driven by the imbibition through a capillary measuring tube II, and calculating the imbibition displacement recovery ratio eta t under the action of pulse;
(6) And (5) adjusting pulse water injection signals with different frequencies through a pulse controller, and repeating the steps (4) - (6).
9. A natural imbibition experiment method by using the imbibition experiment device under the pulse action of claim 6, which is characterized by comprising the following steps:
(1) Cleaning and drying a rock core to be measured, firstly, saturating the rock core to be measured with experimental water, then, displacing the rock core to be measured with experimental oil, so that the rock core to be measured is saturated with the experimental oil, and measuring the volume of saturated oil of the rock core to be measured to be V 0;
(2) Loading a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) When the device is connected, the separation part is removed, and the water supply part, the pulse part and the imbibition part are connected; opening a first switch of the tee joint and a fourth switch of the tee joint, opening a direct pipeline channel between the first tee joint and the second tee joint, closing a second switch of the tee joint and a third switch of the tee joint, and filling water into the intermediate container when liquid directly flows from the tee joint to the second tee joint without passing through a pulse electromagnetic valve;
(4) Opening a horizontal pump, stopping the pump after filling water into the imbibition device, and performing a natural imbibition experiment;
(5) Measuring the volume V t of oil driven by imbibition through a capillary measuring tube I, and calculating the natural imbibition displacement recovery ratio eta t;
10. A continuous water injection imbibition experimental method by using the imbibition experimental device under the pulse action of claim 6, which is characterized by comprising the following steps:
(1) Cleaning and drying a rock core to be measured, firstly, saturating the rock core to be measured with experimental water, then, displacing the rock core to be measured with experimental oil, so that the rock core to be measured is saturated with the experimental oil, and measuring the volume of saturated oil of the rock core to be measured to be V 0;
(2) Loading a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) The water supply part, the pulse part, the seepage part and the separation part are connected, the first switch of the tee joint and the fourth switch of the tee joint are opened in the experiment, a direct pipeline channel between the first tee joint and the second tee joint is opened, the second switch of the tee joint and the third switch of the tee joint are closed, liquid directly flows from the tee joint to the tee joint, the pulse electromagnetic valve is not passed, and water is filled in the intermediate container;
(4) Opening a horizontal pump to inject water for continuous water injection imbibition experiments;
(5) Measuring the volume V t of oil driven by imbibition through a capillary measuring tube II, and calculating the continuous natural imbibition displacement recovery ratio eta t;
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| CN111879678B (en) * | 2020-07-31 | 2022-06-07 | 西南石油大学 | An experimental method for gas-water relative permeability of tight sandstone based on self-absorption method |
| CN112360430B (en) * | 2020-11-04 | 2023-05-12 | 中国石油大学(北京) | Experimental device for crack plugging simulation evaluation |
| CN115077368A (en) * | 2021-06-28 | 2022-09-20 | 山东科技大学 | Testing device and testing method for measuring seepage height of reverse seepage experiment |
| CN114034597B (en) * | 2021-12-09 | 2023-11-21 | 中国石油大学(华东) | Shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device and method |
| CN116990484B (en) * | 2022-04-26 | 2024-12-31 | 大庆油田有限责任公司 | An unconventional core oil saturation method and its application |
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